A Tip on Yashariku's Spiritfall/Sugar

[bladeddragonknight]

People try to say that it is a high risk/high reward thing. Not really. You'll find you will have an easier time using it if you think of it more like a panic button. If your HP is already low and you have a rez coming or you are going to actually die, pop Yash's Spirit/Sugar. The HP/Posture cut won't be that bad since you are already low with your posture at dismal levels and the damage boost combined with a Divine Confetti or Living Force/Flame Vent/Oil can make all the difference.

Also, throw ash in their face...if it works on the boss in question.